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Also, make the temporary file folder writable. The location of the temporary file folder is managed by the instance variable <code>tmp_dir</code> of ReallySimpleCaptcha class. Note that the setting varies depending on the calling plugin. For example, Contact Form 7 uses <code>wp-contents/uploads/wpcf7_captcha</code> as the temporary folder basically, but it can use different folder depending on your settings.

Also, make the temporary file folder writable. The location of the temporary file folder is managed by the instance variable <code>tmp_dir</code> of ReallySimpleCaptcha class. Note that the setting varies depending on the calling plugin. For example, Contact Form 7 uses <code>wp-contents/uploads/wpcf7_captcha</code>as the temporary folder basically, but it can use different folder depending on your settings.